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The test for local strength of metallic materials is necessary for load capacity estimation of the metallic materials. A new test apparatus with stable loading has been developed, and a LabVIEW system for simultaneous detection of load and displacement has been established based on the double-hole micro-shear test method. Tensile and double-hole tests have been carried out on martensitic stainless steel, austenitic stainless steel and high-strengthSlow-alloy steel at room temperature. The material thickness between doubles holes effect on the micro bend-shear test curves is discussed, and the method of applying the normalized parameters and related to the thickness to obtain the local strength parameters has been proposed. The test results show that a slight change in thickness has an obvious measurable effect on the load-displacement curve. It has been validated that the use of improved apparatus and the correlation between standardized parameters and strength parameters to measure the local strength of materials can effectively reduce the influence of thickness on measurement accuracy.